/*
  The contents of this file are subject to the Mozilla Public License Version 1.1
  (the "License"); you may not use this file except in compliance with the License.
  You may obtain a copy of the License at http://www.mozilla.org/MPL/
  Software distributed under the License is distributed on an "AS IS" basis,
  WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License for the
  specific language governing rights and limitations under the License.

  The Original Code is "DataTypeUtil.java".  Description:
  "This class is used to provide utility functions for other datatype classes and methods."

  The Initial Developer of the Original Code is University Health Network. Copyright (C)
  2001.  All Rights Reserved.

  Contributor(s): ______________________________________.

  Alternatively, the contents of this file may be used under the terms of the
  GNU General Public License (the "GPL"), in which case the provisions of the GPL are
  applicable instead of those above.  If you wish to allow use of your version of this
  file only under the terms of the GPL and not to allow others to use your version
  of this file under the MPL, indicate your decision by deleting  the provisions above
  and replace  them with the notice and other provisions required by the GPL License.
  If you do not delete the provisions above, a recipient may use your version of
  this file under either the MPL or the GPL.
*/

namespace NHapi.Base.Model
{
    using System;

    /// <summary> This class is used to provide utility functions for other datatype classes and methods.</summary>
    public class DataTypeUtil
    {
        /// <summary>
        /// Constructor.
        /// </summary>
        public DataTypeUtil()
        {
        }

        /// <summary> This method will return a signed four digit integer indicating the local
        /// GMT offset. This is the HL7 Offset format in integer representation.
        /// </summary>
        public static int LocalGMTOffset => GetGMTOffset(TimeZoneInfo.Local, DateTime.Now);

        /// <summary>
        /// This method will return a signed four digit integer indicating the
        /// GMT offset for the given TimeZoneInfo when applied to the given DateTime.
        /// This is the HL7 Offset format in integer representation.
        /// </summary>
        public static int GetGMTOffset(TimeZoneInfo timeZone, DateTime time)
        {
            var gmtOffSet = timeZone.GetUtcOffset(time);

            // return the offset value HL7 format
            return (gmtOffSet.Hours * 100) + gmtOffSet.Minutes;
        }

        [Obsolete("This method has been replaced by 'PreAppendZeroes'.")]
        [System.Diagnostics.CodeAnalysis.SuppressMessage(
            "StyleCop.CSharp.NamingRules",
            "SA1300:Element should begin with upper-case letter",
            Justification = "As this is a public member, we will duplicate the method and mark this one as obsolete.")]
        public static string preAppendZeroes(int num, int totalDigitLength)
        {
            return PreAppendZeroes(num, totalDigitLength);
        }

        /// <summary> This method will pre-append the zeros to the beginning of num such that the total length
        /// equals totalDigitLength. It will also return the string representation of the new number.
        /// </summary>
        public static string PreAppendZeroes(int num, int totalDigitLength)
        {
            /* pre-append the zeros to the beginning of num such that the total length
            equals totalDigitLength. Return the string representation of the new number*/
            var a = Convert.ToString(num);
            if (a.Length >= totalDigitLength)
            {
                return a;
            }
            else
            {
                var preAppendAmnt = totalDigitLength - a.Length;
                for (var j = 0; j < preAppendAmnt; j++)
                {
                    a = "0" + a;
                }

                return a;
            }
        }
    }
}